Check the fuse and cavity thermostats. There are three cavity thermostats. They can be reset but you need to freeze them to -35ēC. You could probably do it with an air duster turned upside down. Get one that has Trifluoroethane, which boils at -46ēC, Difluoroethane and Tetrafluoroethane aren't cold enough.
I don't know why they made them reset so cold, LG thermostats reset at 0ēC, so you can just throw them in a freezer for a few minutes.